Where am i wrong its showing an error

Question

def user_input():
while True:
user_input == input(": ")
if user_input == 'quit':
break
elif user_input == 'add':
num1= float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1+num2)
print("the answer is " + result)
elif user_input == 'subtract':
num1 = float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1 - num2)

elif user_input == 'multiply':
num1 = float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1 * num2)

elif user_input == 'divide':
num1 = float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1 // num2)

else:
print("unknown input")

Answer 1

Here, fixed:

def calculator():
user_input =''
while True:
user_input=input('Enter add/subtract/multiply/divide or quit: \n')
if user_input == 'quit':
break
elif user_input == 'add':
num1= float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1+num2)
print("the answer is " + result)
elif user_input == 'subtract':
num1 = float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1 - num2)
print(result)

elif user_input == 'multiply':
num1 = float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1 * num2)
print(result)

elif user_input == 'divide':
num1 = float(input("enter a number: "))
num2 = float(input("enter another number: "))
result = str(num1 // num2)
print(result)

else:
print("unknown input"